Room temperature hydrogen gas sensor nanocomposite based on Pd-decorated multi-walled carbon nanotubes thin films

2011 ◽  
Vol 157 (1) ◽  
pp. 169-176 ◽  
Author(s):  
D. Zilli ◽  
P.R. Bonelli ◽  
A.L. Cukierman
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Room Temperature ◽  
Hydrogen Gas ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A Specific NH3 Gas Sensor of a Thick MWCNTs-OH Network for Detection at Room Temperature

2019 ◽  
Vol 56 ◽  
pp. 98-108 ◽  
Author(s):  
Afnan H. Al-Husseini ◽  
Wasan R. Saleh ◽  
Abdulkareem M.A. Al-Sammarraie
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Room Temperature ◽  
Preparation Method ◽  
Ambient Air ◽  
Good Sensitivity ◽  
Filtration Method ◽  
Multi Walled Carbon Nanotubes ◽  
Suspension Filtration ◽  
Walled Carbon Nanotubes

NH3gas sensor was fabricated based on deposited of Functionalized Multi-Walled Carbon Nanotubes (MWCNTs-OH) suspension on filter paper substrates using suspension filtration method. The structural, morphological and optical properties of the MWCNTs film were characterized by XRD, AFM and FTIR techniques. XRD measurement confirmed that the structure of MWCNTs is not affected by the preparation method. The AFM images reflected highly ordered network in the form of a mat. The functional groups and types of bonding have appeared in the FTIR spectra. The fingerprint (C-C stretch) of MWCNTs appears in 1365 cm-1, and the backbone of CNTs observed at 1645 cm-1. A homemade sensing device was used to evaluate the fabrication network toward NH3gas at ppm levels as well as the response to sensitivity by changing the concentration. MWCNTs-OH network of 8mm thickness showed an increase in resistance upon exposure to the NH3gas. The sensor exhibits a good sensitivity for low concentration of NH3gas at room temperature. The sensitivities of the network were 2.5% at 14ppm, 5.3% at 27ppm and 17.6% at 68ppm. Further investigations showed that the network was specific sensitive to NH3gas in the environment and not affected by the amount of ambient air.

Specific NH3 Gas Sensor Worked at Room Temperature Based on MWCNTs-OH Network

2018 ◽  
Vol 23 ◽  
pp. 8-16 ◽  
Author(s):  
Afnan H. Al-Husseini ◽  
Abdulkareem M. A. Al-Sammarraie ◽  
Wasan R. Saleh
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Room Temperature ◽  
Ambient Air ◽  
Close Packing ◽  
Absorbance Spectrum ◽  
Sem Images ◽  
Vacuum Filtration ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Functionalized Multi-Walled Carbon Nanotubes (MWCNTs-OH) network with thickness 4μm was made by the vacuum filtration from suspension (FFS) method. The morphology, structure and optical properties of the MWCNTs film were characterized by SEM and UV-Vis. spectra techniques. The SEM images reflected highly ordered network in the form of ropes or bundles with close-packing which looks like spaghetti. The absorbance spectrum revealed that the network has a good absorbance in the UV-Vis. region. The gas sensor system was used to test the MWCNT-OH network to detect NH3gas at room temperature. The resistance of the sensor was increased when exposed to the NH3gas. The sensitivities of the network were 1.3% at 14ppm, 3.3% at 27ppm and 6.13% at 68ppm. The sensor is specifically sensitive to NH3gas and does not affect by the amount of ambient air.

scholarly journals A Room Temperature VOCs Gas Sensor Based on a Layer by Layer Multi-Walled Carbon Nanotubes/Poly-ethylene Glycol Composite

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 3113 ◽  
Author(s):  
Zitao Liu ◽  
Tuoyu Yang ◽  
Ying Dong ◽  
Xiaohao Wang
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensor ◽  
Room Temperature ◽  
High Sensitivity ◽  
Fast Response ◽  
Layer By Layer ◽  
Resistance Change ◽  
Multi Walled Carbon Nanotubes ◽  
Electric Nose ◽  
Walled Carbon Nanotubes

Sensitive detection of volatile organic compounds (VOCs) is significant for environmental monitoring and medical applications. In this work, multi-walled carbon nanotubes (MWCNTs) and polyethylene glycol (PEG) that have good adsorption for VOCs, were sprayed layer by layer on an interdigitated electrode (IDE) to build a sensitive VOCs gas sensor. The relative resistance change (△R/R) when the sensor was exposed to VOCs was measured. The sensor showed high sensitivity to acetone, ethanol, isopropanol and isoprene with fast response (110 ± 5 s) and recovery (152 ± 5 s) at room temperature, and the lower detection limit (LDL) of the sensor reached 9 ppm. With the micro-fabricated IDE structure, the sensor can be easily built into an electric nose for VOC recognition and measurement.

scholarly journals A Facile and Efficient Bromination of Multi-Walled Carbon Nanotubes

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3161
Author(s):  
Sandra Zarska ◽  
Damian Kulawik ◽  
Volodymyr Pavlyuk ◽  
Piotr Tomasik ◽  
Alicja Bachmatiuk ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Covalent Attachment ◽  
Closed Vessel ◽  
Dangling Bonds ◽  
Magnetic Stirrer ◽  
Defect Sites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Covalently Bound

The bromination of multi-walled carbon nanotubes (MWCNT) was performed with vapor bromine in a closed vessel, and they were subjected to intensive stirring with a magnetic stirrer for up to 14 days. The efficiency of bromination was compared depending upon duration. The structure and surface of the crude and purified products were characterized by detailed physicochemical analyses, such as SEM/EDS, TEM, XRD, TGA, Raman, and XPS spectroscopies. The studies confirmed the presence of bromine covalently bound with nanotubes as well as the formation of inclusion MWCNT–Br2 complexes. It was confirmed that Br2 molecules are absorbed on the surface of nanotubes (forming the CNT-Br2 complex), while they can dissociate close to dangling bonds at CNT defect sites with the formation of covalent C−Br bonds. Thus, any covalent attachment of bromine to the graphitic surface achieved around room temperature is likely related to the defects in the MWCNTs. The best results, i.e., the highest amount of attached Br2, were obtained for brominated nanotubes brominated for 10 days, with the content of covalently bound bromine being 0.68 at% (by XPS).

scholarly journals Sensing mechanism of an optimized room temperature optical hydrogen gas sensor made of zinc oxide thin films

2020 ◽  
Vol 9 (5) ◽  
pp. 10624-10634
Author(s):  
Siti Nor Aliffah Mustaffa ◽  
Nurul Assikin Ariffin ◽  
Ahmed Lateef Khalaf ◽  
Mohd. Hanif Yaacob ◽  
Nizam Tamchek ◽  
...  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Gas Sensor ◽  
Room Temperature ◽  
Hydrogen Gas ◽  
Oxide Thin Films ◽  
Sensing Mechanism

Room-temperature hydrogen sensing properties of SnO2-coated multi-walled carbon nanotubes

Carbon ◽  
2010 ◽  
Vol 48 (13) ◽  
pp. 3976
Author(s):  
Xue Sun ◽  
Hai-Tao Fang ◽  
Hui-Long Yu ◽  
Yi Chu ◽  
Bao-You Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Sensing Properties ◽  
Hydrogen Sensing ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Carbon Nanofibers from Carbon Nanotubes by 1.2 keVAr+Sputtering at Room Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Shuang-Xi Xue ◽  
Qin-Tao Li ◽  
Xian-Rui Zhao ◽  
Qin-Yi Shi ◽  
Zhi-Gang Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Carbon Nanofibers ◽  
Carbon Nanoparticles ◽  
Room Temperature ◽  
Ion Irradiation ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Carbon Nanowires

Multi-walled carbon nanotubes (MWCNTs) were irradiated by 1.2 keV Ar ion beams for 15–60 min at room temperature with current density of 60 µA/cm2. The morphology and microstructure are investigated by scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The results show that carbon nanofibers are achieved after 60 min ion irradiation and the formation of carbon nanofibers proceeds through four periods, carbon nanotubes—amorphous carbon nanowires—carbon nanoparticles along the tube axis—conical protrusions on the nanoparticles surface—carbon nanofibers from the conical protrusions.

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